A copper cable is to be designed to carry a current of 300 A with a power loss of only 2.0 watts per meter. What is the required radius of the copper cable? (The resistivity of copper is 1.7 × 10^-8 W × m.)
1.6 cm
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The Moon is about one-quarter the diameter of Earth. How does its mass compare?
A. The Moon is 1/81 as massive as Earth. B. The Moon is 1/4 as massive as Earth. C. The Moon is 1/6 as massive as Earth. D. The Moon is 1/32 as massive as Earth.
The graph shows how a star's orbital speed varies with time because of the gravitational tug of an orbiting planet. These data were obtained by measuring __________.
Fill in the blank(s) with the appropriate word(s).
Two ideal Carnot heat engines have the same efficiency. One operates between 5.0 × 102 K and 3.0 × 102 K, and the other between 4.0 × 102 K and some lower temperature. What is the lower temperature?
A) 200 K B) 220 K C) 240 K D) 260 K E) 280 K
The acceleration due to gravity on Planet A is one-sixth what it is on Planet B, and the radius of the Planet A is one-fourth that of Planet B. The mass of Planet A is what fraction of the mass of Planet B?
A) 1/6 B) 1/16 C) 1/24 D) 1/96 E) 1/12